Hard line fitting sizes

Installing a dual circuit master cylinder on my 65 Barracuda with manual 10” drums f&r. I have the additional distribution block, but the ports on the master cyl are larger and one larger than the other. Its a new or reman mc w the bolt on cap, rear reservoir is slightly larger than the front. I no longer have the box w the part. # on it, sadly.
-Can anyone tell me the size of mc fittings?
-Is it ok to use an adapter fitting at the mc?